|Table of Contents|

Effects of Nutrient Solution Concentration and Ratio of NO-3-N to NH+4-N on Tomato Growth in Soilless Culture

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年24
Page:
39-45
Research Field:
Publishing date:

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Title:
Effects of Nutrient Solution Concentration and Ratio of NO-3-N to NH+4-N on Tomato Growth in Soilless Culture
Author(s):
LI Fei1; 2; DONG Jing3; ZHAO Zhiwei3; CHEN Shihao1; LIANG Bin1; LI Junliang1
(1.College of Resources and Environment,Qingdao Agricultural University/Shandong Water Fertilizer Integrated Engineering Technology Research Center,Qingdao,Shandong 266109；2.Weifang Vocational College，Weifang,Shandong 262700；3.Agricultural Bureau of Shouguang，National Shouguang Comprehensive Test Station for Bulk Vegetable System，Weifang,Shandong 262700)
Keywords:
soilless culture; nitrogen form; root; greenhouse vegetable
PACS:
-
DOI:
10.11937/bfyy.20200914
Abstract:
Tomato was used as test material,a pot experiment was conducted to evaluate the effects of nutrient solution concentrations (the N content was 3.2 mmol?L-1 (T0.4),5.6 mmol?L-1 (T0.7),8.0 mmol?L-1 (T1),16.0 mmol?L-1 (T2),24.0 mmol?L-1 (T3)) and nitrate-ammonium ratio(NO-3-N/NH+4-N=100/0(R100),75/25(R75),50/50(R50),25/75(R25),0/100(R0)) on tomato seedling growth in soilless culture.The results showed that there was a significant interaction between concentration and ratios of NO-3-N to NH+4-N on plant height and biomass of tomato.Aboveground biomass of tomato in T2 treatment was the largest,which was significantly increased by 7.8%-62.2% compared with other concentration treatments under the treatments of R100 and R75.In the concentrations treatments of T0.7 and T1,the aboveground biomass of R75 treatment significantly increased by 7.6% and 13.6% than R100 treatment.In the treatments of R25 and R0,which the NH+4-N content was higher than NO-3-N,tomato plant height significantly reduced by 19.6% to 26.9%,and aboveground biomass reduced by 17.8% to 48.6% than the treatment of R100.Total root length,root surface area and root biomass decreased with the increase of nutrient solution concentration.Under the lower concentration (T0.4) of nutrient solution,nitrate nitrogen was more beneficial to the growth of tomato roots,and root surface area,total root length and root biomass of R100 treatment were significantly increased by 23.7%-88.7%,22.2%-112.7% and 5.0%-180.0% compared with other ratio of nitrate to ammonium treatments.Root-shoot ratio of T0.4 treatment was significantly higher by 1.3-1.7 times than T1 treatment.The SPAD value in the treatment of combined addition of NO-3-N and NH+4-N increased by 9.9% to 13.2% than the alone addition of NO-3-N or NH+4-N.In general,in the stage of tomato seedling,the recommended nutrient solution concentration EC value was 0.6-1.4 mS?cm-1 and the salt content was 0.15‰ and 1.01‰,in which the N concentration was 3.2-5.6 mmol?L-1,and the suitable the ratio of nitrate to ammonium was 75/25,the recommended concentration and NO-3-N/NH+4-N ratio could enhance the growth of tomato roots.

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Last Update: 2021-03-26